[mirror_ubuntu-artful-kernel.git] / arch / cris / include / asm / uaccess.h

/*
 * Authors:    Bjorn Wesen (bjornw@axis.com)
 *	       Hans-Peter Nilsson (hp@axis.com)
 */

/* Asm:s have been tweaked (within the domain of correctness) to give
   satisfactory results for "gcc version 2.96 20000427 (experimental)".

   Check regularly...

   Register $r9 is chosen for temporaries, being a call-clobbered register
   first in line to be used (notably for local blocks), not colliding with
   parameter registers.  */

#ifndef _CRIS_UACCESS_H
#define _CRIS_UACCESS_H

#include <asm/processor.h>
#include <asm/page.h>

/*
 * The fs value determines whether argument validity checking should be
 * performed or not.  If get_fs() == USER_DS, checking is performed, with
 * get_fs() == KERNEL_DS, checking is bypassed.
 *
 * For historical reasons, these macros are grossly misnamed.
 */

#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })

/* addr_limit is the maximum accessible address for the task. we misuse
 * the KERNEL_DS and USER_DS values to both assign and compare the
 * addr_limit values through the equally misnamed get/set_fs macros.
 * (see above)
 */

#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
#define USER_DS		MAKE_MM_SEG(TASK_SIZE)

#define get_ds()	(KERNEL_DS)
#define get_fs()	(current_thread_info()->addr_limit)
#define set_fs(x)	(current_thread_info()->addr_limit = (x))

#define segment_eq(a, b)	((a).seg == (b).seg)

#define __kernel_ok (uaccess_kernel())
#define __user_ok(addr, size) \
	(((size) <= TASK_SIZE) && ((addr) <= TASK_SIZE-(size)))
#define __access_ok(addr, size) (__kernel_ok || __user_ok((addr), (size)))
#define access_ok(type, addr, size) __access_ok((unsigned long)(addr), (size))

#include <arch/uaccess.h>
#include <asm/extable.h>

/*
 * These are the main single-value transfer routines.  They automatically
 * use the right size if we just have the right pointer type.
 *
 * This gets kind of ugly. We want to return _two_ values in "get_user()"
 * and yet we don't want to do any pointers, because that is too much
 * of a performance impact. Thus we have a few rather ugly macros here,
 * and hide all the ugliness from the user.
 *
 * The "__xxx" versions of the user access functions are versions that
 * do not verify the address space, that must have been done previously
 * with a separate "access_ok()" call (this is used when we do multiple
 * accesses to the same area of user memory).
 *
 * As we use the same address space for kernel and user data on
 * CRIS, we can just do these as direct assignments.  (Of course, the
 * exception handling means that it's no longer "just"...)
 */
#define get_user(x, ptr) \
	__get_user_check((x), (ptr), sizeof(*(ptr)))
#define put_user(x, ptr) \
	__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

#define __get_user(x, ptr) \
	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __put_user(x, ptr) \
	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))

extern long __put_user_bad(void);

#define __put_user_size(x, ptr, size, retval)				\
do {									\
	retval = 0;							\
	switch (size) {							\
	case 1:								\
		__put_user_asm(x, ptr, retval, "move.b");		\
		break;							\
	case 2:								\
		__put_user_asm(x, ptr, retval, "move.w");		\
		break;							\
	case 4:								\
		__put_user_asm(x, ptr, retval, "move.d");		\
		break;							\
	case 8:								\
		__put_user_asm_64(x, ptr, retval);			\
		break;							\
	default:							\
		__put_user_bad();					\
	}								\
} while (0)

#define __get_user_size(x, ptr, size, retval)				\
do {									\
	retval = 0;							\
	switch (size) {							\
	case 1:								\
		__get_user_asm(x, ptr, retval, "move.b");		\
		break;							\
	case 2:								\
		__get_user_asm(x, ptr, retval, "move.w");		\
		break;							\
	case 4:								\
		__get_user_asm(x, ptr, retval, "move.d");		\
		break;							\
	case 8:								\
		__get_user_asm_64(x, ptr, retval);			\
		break;							\
	default:							\
		(x) = __get_user_bad();					\
	}								\
} while (0)

#define __put_user_nocheck(x, ptr, size)		\
({							\
	long __pu_err;					\
	__put_user_size((x), (ptr), (size), __pu_err);	\
	__pu_err;					\
})

#define __put_user_check(x, ptr, size)					\
({									\
	long __pu_err = -EFAULT;					\
	__typeof__(*(ptr)) *__pu_addr = (ptr);				\
	if (access_ok(VERIFY_WRITE, __pu_addr, size))			\
		__put_user_size((x), __pu_addr, (size), __pu_err);	\
	__pu_err;							\
})

struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))


#define __get_user_nocheck(x, ptr, size)			\
({								\
	long __gu_err, __gu_val;				\
	__get_user_size(__gu_val, (ptr), (size), __gu_err);	\
	(x) = (__force __typeof__(*(ptr)))__gu_val;		\
	__gu_err;						\
})

#define __get_user_check(x, ptr, size)					\
({									\
	long __gu_err = -EFAULT, __gu_val = 0;				\
	const __typeof__(*(ptr)) *__gu_addr = (ptr);			\
	if (access_ok(VERIFY_READ, __gu_addr, size))			\
		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
	__gu_err;							\
})

extern long __get_user_bad(void);

/* More complex functions.  Most are inline, but some call functions that
   live in lib/usercopy.c  */

extern unsigned long __copy_user(void __user *to, const void *from, unsigned long n);
extern unsigned long __copy_user_zeroing(void *to, const void __user *from, unsigned long n);
extern unsigned long __do_clear_user(void __user *to, unsigned long n);

static inline long
__strncpy_from_user(char *dst, const char __user *src, long count)
{
	return __do_strncpy_from_user(dst, src, count);
}

static inline long
strncpy_from_user(char *dst, const char __user *src, long count)
{
	long res = -EFAULT;

	if (access_ok(VERIFY_READ, src, 1))
		res = __do_strncpy_from_user(dst, src, count);
	return res;
}


/* Note that these expand awfully if made into switch constructs, so
   don't do that.  */

static inline unsigned long
__constant_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	unsigned long ret = 0;

	if (n == 0)
		;
	else if (n == 1)
		__asm_copy_from_user_1(to, from, ret);
	else if (n == 2)
		__asm_copy_from_user_2(to, from, ret);
	else if (n == 3)
		__asm_copy_from_user_3(to, from, ret);
	else if (n == 4)
		__asm_copy_from_user_4(to, from, ret);
	else if (n == 5)
		__asm_copy_from_user_5(to, from, ret);
	else if (n == 6)
		__asm_copy_from_user_6(to, from, ret);
	else if (n == 7)
		__asm_copy_from_user_7(to, from, ret);
	else if (n == 8)
		__asm_copy_from_user_8(to, from, ret);
	else if (n == 9)
		__asm_copy_from_user_9(to, from, ret);
	else if (n == 10)
		__asm_copy_from_user_10(to, from, ret);
	else if (n == 11)
		__asm_copy_from_user_11(to, from, ret);
	else if (n == 12)
		__asm_copy_from_user_12(to, from, ret);
	else if (n == 13)
		__asm_copy_from_user_13(to, from, ret);
	else if (n == 14)
		__asm_copy_from_user_14(to, from, ret);
	else if (n == 15)
		__asm_copy_from_user_15(to, from, ret);
	else if (n == 16)
		__asm_copy_from_user_16(to, from, ret);
	else if (n == 20)
		__asm_copy_from_user_20(to, from, ret);
	else if (n == 24)
		__asm_copy_from_user_24(to, from, ret);
	else
		ret = __copy_user_zeroing(to, from, n);

	return ret;
}

/* Ditto, don't make a switch out of this.  */

static inline unsigned long
__constant_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	unsigned long ret = 0;

	if (n == 0)
		;
	else if (n == 1)
		__asm_copy_to_user_1(to, from, ret);
	else if (n == 2)
		__asm_copy_to_user_2(to, from, ret);
	else if (n == 3)
		__asm_copy_to_user_3(to, from, ret);
	else if (n == 4)
		__asm_copy_to_user_4(to, from, ret);
	else if (n == 5)
		__asm_copy_to_user_5(to, from, ret);
	else if (n == 6)
		__asm_copy_to_user_6(to, from, ret);
	else if (n == 7)
		__asm_copy_to_user_7(to, from, ret);
	else if (n == 8)
		__asm_copy_to_user_8(to, from, ret);
	else if (n == 9)
		__asm_copy_to_user_9(to, from, ret);
	else if (n == 10)
		__asm_copy_to_user_10(to, from, ret);
	else if (n == 11)
		__asm_copy_to_user_11(to, from, ret);
	else if (n == 12)
		__asm_copy_to_user_12(to, from, ret);
	else if (n == 13)
		__asm_copy_to_user_13(to, from, ret);
	else if (n == 14)
		__asm_copy_to_user_14(to, from, ret);
	else if (n == 15)
		__asm_copy_to_user_15(to, from, ret);
	else if (n == 16)
		__asm_copy_to_user_16(to, from, ret);
	else if (n == 20)
		__asm_copy_to_user_20(to, from, ret);
	else if (n == 24)
		__asm_copy_to_user_24(to, from, ret);
	else
		ret = __copy_user(to, from, n);

	return ret;
}

/* No switch, please.  */

static inline unsigned long
__constant_clear_user(void __user *to, unsigned long n)
{
	unsigned long ret = 0;

	if (n == 0)
		;
	else if (n == 1)
		__asm_clear_1(to, ret);
	else if (n == 2)
		__asm_clear_2(to, ret);
	else if (n == 3)
		__asm_clear_3(to, ret);
	else if (n == 4)
		__asm_clear_4(to, ret);
	else if (n == 8)
		__asm_clear_8(to, ret);
	else if (n == 12)
		__asm_clear_12(to, ret);
	else if (n == 16)
		__asm_clear_16(to, ret);
	else if (n == 20)
		__asm_clear_20(to, ret);
	else if (n == 24)
		__asm_clear_24(to, ret);
	else
		ret = __do_clear_user(to, n);

	return ret;
}


static inline size_t clear_user(void __user *to, size_t n)
{
	if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
		return n;
	if (__builtin_constant_p(n))
		return __constant_clear_user(to, n);
	else
		return __do_clear_user(to, n);
}

static inline size_t copy_from_user(void *to, const void __user *from, size_t n)
{
	size_t res = n;
	if (likely(access_ok(VERIFY_READ, from, n))) {
		if (__builtin_constant_p(n))
			res = __constant_copy_from_user(to, from, n);
		else
			res = __copy_user_zeroing(to, from, n);
	}
	if (unlikely(res))
		memset(to + n - res , 0, res);
	return res;
}

static inline size_t copy_to_user(void __user *to, const void *from, size_t n)
{
	if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
		return n;
	if (__builtin_constant_p(n))
		return __constant_copy_to_user(to, from, n);
	else
		return __copy_user(to, from, n);
}

/* We let the __ versions of copy_from/to_user inline, because they're often
 * used in fast paths and have only a small space overhead.
 */

static inline unsigned long
__generic_copy_from_user_nocheck(void *to, const void __user *from,
				 unsigned long n)
{
	return __copy_user_zeroing(to, from, n);
}

static inline unsigned long
__generic_copy_to_user_nocheck(void __user *to, const void *from,
			       unsigned long n)
{
	return __copy_user(to, from, n);
}

static inline unsigned long
__generic_clear_user_nocheck(void __user *to, unsigned long n)
{
	return __do_clear_user(to, n);
}

/* without checking */

#define __copy_to_user(to, from, n) \
	__generic_copy_to_user_nocheck((to), (from), (n))
#define __copy_from_user(to, from, n) \
	__generic_copy_from_user_nocheck((to), (from), (n))
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
#define __clear_user(to, n) __generic_clear_user_nocheck((to), (n))

#define strlen_user(str)	strnlen_user((str), 0x7ffffffe)

#endif	/* _CRIS_UACCESS_H */
Commit	Line	Data
9987c19e	1	/*
1da177e4 LT	2	* Authors: Bjorn Wesen (bjornw@axis.com)
1da177e4 LT	3	* Hans-Peter Nilsson (hp@axis.com)
1da177e4 LT	4	*/
	5
	6	/* Asm:s have been tweaked (within the domain of correctness) to give
	7	satisfactory results for "gcc version 2.96 20000427 (experimental)".
	8
	9	Check regularly...
	10
	11	Register $r9 is chosen for temporaries, being a call-clobbered register
	12	first in line to be used (notably for local blocks), not colliding with
	13	parameter registers. */
	14
	15	#ifndef _CRIS_UACCESS_H
	16	#define _CRIS_UACCESS_H
	17
1da177e4 LT	18	#include <asm/processor.h>
	19	#include <asm/page.h>
	20
1da177e4 LT	21	/*
	22	* The fs value determines whether argument validity checking should be
	23	* performed or not. If get_fs() == USER_DS, checking is performed, with
	24	* get_fs() == KERNEL_DS, checking is bypassed.
	25	*
	26	* For historical reasons, these macros are grossly misnamed.
	27	*/
	28
	29	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	30
	31	/* addr_limit is the maximum accessible address for the task. we misuse
9987c19e	32	* the KERNEL_DS and USER_DS values to both assign and compare the
1da177e4 LT	33	* addr_limit values through the equally misnamed get/set_fs macros.
	34	* (see above)
	35	*/
	36
	37	#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
	38	#define USER_DS MAKE_MM_SEG(TASK_SIZE)
	39
	40	#define get_ds() (KERNEL_DS)
	41	#define get_fs() (current_thread_info()->addr_limit)
	42	#define set_fs(x) (current_thread_info()->addr_limit = (x))
	43
83f1588e	44	#define segment_eq(a, b) ((a).seg == (b).seg)
1da177e4	45
db68ce10	46	#define __kernel_ok (uaccess_kernel())
83f1588e	47	#define __user_ok(addr, size) \
9987c19e	48	(((size) <= TASK_SIZE) && ((addr) <= TASK_SIZE-(size)))
83f1588e MT	49	#define __access_ok(addr, size) (__kernel_ok \|\| __user_ok((addr), (size)))
83f1588e MT	50	#define access_ok(type, addr, size) __access_ok((unsigned long)(addr), (size))
1da177e4	51
556dcee7	52	#include <arch/uaccess.h>
a8be3445	53	#include <asm/extable.h>
1da177e4 LT	54
	55	/*
	56	* These are the main single-value transfer routines. They automatically
	57	* use the right size if we just have the right pointer type.
	58	*
	59	* This gets kind of ugly. We want to return _two_ values in "get_user()"
	60	* and yet we don't want to do any pointers, because that is too much
	61	* of a performance impact. Thus we have a few rather ugly macros here,
	62	* and hide all the ugliness from the user.
	63	*
	64	* The "__xxx" versions of the user access functions are versions that
	65	* do not verify the address space, that must have been done previously
	66	* with a separate "access_ok()" call (this is used when we do multiple
	67	* accesses to the same area of user memory).
	68	*
	69	* As we use the same address space for kernel and user data on
	70	* CRIS, we can just do these as direct assignments. (Of course, the
	71	* exception handling means that it's no longer "just"...)
	72	*/
83f1588e	73	#define get_user(x, ptr) \
9987c19e	74	__get_user_check((x), (ptr), sizeof(*(ptr)))
83f1588e	75	#define put_user(x, ptr) \
9987c19e	76	__put_user_check((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
1da177e4	77
83f1588e	78	#define __get_user(x, ptr) \
9987c19e	79	__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
83f1588e	80	#define __put_user(x, ptr) \
9987c19e	81	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
1da177e4 LT	82
	83	extern long __put_user_bad(void);
	84
83f1588e MT	85	#define __put_user_size(x, ptr, size, retval) \
	86	do { \
	87	retval = 0; \
	88	switch (size) { \
9987c19e JN	89	case 1: \
	90	__put_user_asm(x, ptr, retval, "move.b"); \
	91	break; \
	92	case 2: \
	93	__put_user_asm(x, ptr, retval, "move.w"); \
	94	break; \
	95	case 4: \
	96	__put_user_asm(x, ptr, retval, "move.d"); \
	97	break; \
	98	case 8: \
	99	__put_user_asm_64(x, ptr, retval); \
	100	break; \
	101	default: \
	102	__put_user_bad(); \
83f1588e	103	} \
1da177e4 LT	104	} while (0)
1da177e4 LT	105
83f1588e MT	106	#define __get_user_size(x, ptr, size, retval) \
	107	do { \
	108	retval = 0; \
	109	switch (size) { \
9987c19e JN	110	case 1: \
	111	__get_user_asm(x, ptr, retval, "move.b"); \
	112	break; \
	113	case 2: \
	114	__get_user_asm(x, ptr, retval, "move.w"); \
	115	break; \
	116	case 4: \
	117	__get_user_asm(x, ptr, retval, "move.d"); \
	118	break; \
	119	case 8: \
	120	__get_user_asm_64(x, ptr, retval); \
	121	break; \
	122	default: \
	123	(x) = __get_user_bad(); \
83f1588e	124	} \
1da177e4 LT	125	} while (0)
1da177e4 LT	126
83f1588e	127	#define __put_user_nocheck(x, ptr, size) \
1da177e4 LT	128	({ \
1da177e4 LT	129	long __pu_err; \
83f1588e	130	__put_user_size((x), (ptr), (size), __pu_err); \
1da177e4 LT	131	__pu_err; \
	132	})
	133
83f1588e MT	134	#define __put_user_check(x, ptr, size) \
	135	({ \
	136	long __pu_err = -EFAULT; \
	137	__typeof__((ptr)) __pu_addr = (ptr); \
	138	if (access_ok(VERIFY_WRITE, __pu_addr, size)) \
	139	__put_user_size((x), __pu_addr, (size), __pu_err); \
	140	__pu_err; \
1da177e4 LT	141	})
	142
	143	struct __large_struct { unsigned long buf[100]; };
	144	#define __m(x) ((struct __large_struct )(x))
	145
	146
	147
83f1588e	148	#define __get_user_nocheck(x, ptr, size) \
1da177e4 LT	149	({ \
1da177e4 LT	150	long __gu_err, __gu_val; \
83f1588e	151	__get_user_size(__gu_val, (ptr), (size), __gu_err); \
458e3192	152	(x) = (__force __typeof__(*(ptr)))__gu_val; \
1da177e4 LT	153	__gu_err; \
	154	})
	155
83f1588e	156	#define __get_user_check(x, ptr, size) \
1da177e4 LT	157	({ \
	158	long __gu_err = -EFAULT, __gu_val = 0; \
	159	const __typeof__((ptr)) __gu_addr = (ptr); \
83f1588e MT	160	if (access_ok(VERIFY_READ, __gu_addr, size)) \
83f1588e MT	161	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
458e3192	162	(x) = (__force __typeof__(*(ptr)))__gu_val; \
1da177e4 LT	163	__gu_err; \
	164	})
	165
	166	extern long __get_user_bad(void);
	167
	168	/* More complex functions. Most are inline, but some call functions that
	169	live in lib/usercopy.c */
	170
07f2402b JN	171	extern unsigned long __copy_user(void __user to, const void from, unsigned long n);
	172	extern unsigned long __copy_user_zeroing(void to, const void __user from, unsigned long n);
	173	extern unsigned long __do_clear_user(void __user *to, unsigned long n);
1da177e4	174
d9b5444e	175	static inline long
1da177e4 LT	176	__strncpy_from_user(char dst, const char __user src, long count)
	177	{
	178	return __do_strncpy_from_user(dst, src, count);
	179	}
	180
d9b5444e	181	static inline long
1da177e4 LT	182	strncpy_from_user(char dst, const char __user src, long count)
	183	{
	184	long res = -EFAULT;
9987c19e	185
1da177e4 LT	186	if (access_ok(VERIFY_READ, src, 1))
	187	res = __do_strncpy_from_user(dst, src, count);
	188	return res;
	189	}
	190
	191
07f2402b	192	/* Note that these expand awfully if made into switch constructs, so
1da177e4 LT	193	don't do that. */
1da177e4 LT	194
d9b5444e	195	static inline unsigned long
1da177e4 LT	196	__constant_copy_from_user(void to, const void __user from, unsigned long n)
	197	{
	198	unsigned long ret = 0;
9987c19e	199
1da177e4 LT	200	if (n == 0)
	201	;
	202	else if (n == 1)
	203	__asm_copy_from_user_1(to, from, ret);
	204	else if (n == 2)
	205	__asm_copy_from_user_2(to, from, ret);
	206	else if (n == 3)
	207	__asm_copy_from_user_3(to, from, ret);
	208	else if (n == 4)
	209	__asm_copy_from_user_4(to, from, ret);
	210	else if (n == 5)
	211	__asm_copy_from_user_5(to, from, ret);
	212	else if (n == 6)
	213	__asm_copy_from_user_6(to, from, ret);
	214	else if (n == 7)
	215	__asm_copy_from_user_7(to, from, ret);
	216	else if (n == 8)
	217	__asm_copy_from_user_8(to, from, ret);
	218	else if (n == 9)
	219	__asm_copy_from_user_9(to, from, ret);
	220	else if (n == 10)
	221	__asm_copy_from_user_10(to, from, ret);
	222	else if (n == 11)
	223	__asm_copy_from_user_11(to, from, ret);
	224	else if (n == 12)
	225	__asm_copy_from_user_12(to, from, ret);
	226	else if (n == 13)
	227	__asm_copy_from_user_13(to, from, ret);
	228	else if (n == 14)
	229	__asm_copy_from_user_14(to, from, ret);
	230	else if (n == 15)
	231	__asm_copy_from_user_15(to, from, ret);
	232	else if (n == 16)
	233	__asm_copy_from_user_16(to, from, ret);
	234	else if (n == 20)
	235	__asm_copy_from_user_20(to, from, ret);
	236	else if (n == 24)
	237	__asm_copy_from_user_24(to, from, ret);
	238	else
eb47e029	239	ret = __copy_user_zeroing(to, from, n);
1da177e4 LT	240
	241	return ret;
	242	}
	243
	244	/* Ditto, don't make a switch out of this. */
	245
d9b5444e	246	static inline unsigned long
1da177e4 LT	247	__constant_copy_to_user(void __user to, const void from, unsigned long n)
	248	{
	249	unsigned long ret = 0;
9987c19e	250
1da177e4 LT	251	if (n == 0)
	252	;
	253	else if (n == 1)
	254	__asm_copy_to_user_1(to, from, ret);
	255	else if (n == 2)
	256	__asm_copy_to_user_2(to, from, ret);
	257	else if (n == 3)
	258	__asm_copy_to_user_3(to, from, ret);
	259	else if (n == 4)
	260	__asm_copy_to_user_4(to, from, ret);
	261	else if (n == 5)
	262	__asm_copy_to_user_5(to, from, ret);
	263	else if (n == 6)
	264	__asm_copy_to_user_6(to, from, ret);
	265	else if (n == 7)
	266	__asm_copy_to_user_7(to, from, ret);
	267	else if (n == 8)
	268	__asm_copy_to_user_8(to, from, ret);
	269	else if (n == 9)
	270	__asm_copy_to_user_9(to, from, ret);
	271	else if (n == 10)
	272	__asm_copy_to_user_10(to, from, ret);
	273	else if (n == 11)
	274	__asm_copy_to_user_11(to, from, ret);
	275	else if (n == 12)
	276	__asm_copy_to_user_12(to, from, ret);
	277	else if (n == 13)
	278	__asm_copy_to_user_13(to, from, ret);
	279	else if (n == 14)
	280	__asm_copy_to_user_14(to, from, ret);
	281	else if (n == 15)
	282	__asm_copy_to_user_15(to, from, ret);
	283	else if (n == 16)
	284	__asm_copy_to_user_16(to, from, ret);
	285	else if (n == 20)
	286	__asm_copy_to_user_20(to, from, ret);
	287	else if (n == 24)
	288	__asm_copy_to_user_24(to, from, ret);
	289	else
eb47e029	290	ret = __copy_user(to, from, n);
1da177e4 LT	291
	292	return ret;
	293	}
	294
	295	/* No switch, please. */
	296
d9b5444e	297	static inline unsigned long
1da177e4 LT	298	__constant_clear_user(void __user *to, unsigned long n)
	299	{
	300	unsigned long ret = 0;
9987c19e	301
1da177e4 LT	302	if (n == 0)
	303	;
	304	else if (n == 1)
	305	__asm_clear_1(to, ret);
	306	else if (n == 2)
	307	__asm_clear_2(to, ret);
	308	else if (n == 3)
	309	__asm_clear_3(to, ret);
	310	else if (n == 4)
	311	__asm_clear_4(to, ret);
	312	else if (n == 8)
	313	__asm_clear_8(to, ret);
	314	else if (n == 12)
	315	__asm_clear_12(to, ret);
	316	else if (n == 16)
	317	__asm_clear_16(to, ret);
	318	else if (n == 20)
	319	__asm_clear_20(to, ret);
	320	else if (n == 24)
	321	__asm_clear_24(to, ret);
	322	else
eb47e029	323	ret = __do_clear_user(to, n);
1da177e4 LT	324
	325	return ret;
	326	}
	327
	328
eb47e029 AV	329	static inline size_t clear_user(void __user *to, size_t n)
	330	{
	331	if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
	332	return n;
	333	if (__builtin_constant_p(n))
	334	return __constant_clear_user(to, n);
	335	else
	336	return __do_clear_user(to, n);
	337	}
1da177e4	338
eb47e029 AV	339	static inline size_t copy_from_user(void to, const void __user from, size_t n)
eb47e029 AV	340	{
07f78b30 AV	341	size_t res = n;
	342	if (likely(access_ok(VERIFY_READ, from, n))) {
	343	if (__builtin_constant_p(n))
	344	res = __constant_copy_from_user(to, from, n);
	345	else
	346	res = __copy_user_zeroing(to, from, n);
eb47e029	347	}
07f78b30 AV	348	if (unlikely(res))
	349	memset(to + n - res , 0, res);
	350	return res;
eb47e029	351	}
1da177e4	352
eb47e029 AV	353	static inline size_t copy_to_user(void __user to, const void from, size_t n)
	354	{
	355	if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
	356	return n;
	357	if (__builtin_constant_p(n))
	358	return __constant_copy_to_user(to, from, n);
	359	else
	360	return __copy_user(to, from, n);
	361	}
1da177e4 LT	362
	363	/* We let the __ versions of copy_from/to_user inline, because they're often
	364	* used in fast paths and have only a small space overhead.
	365	*/
	366
d9b5444e	367	static inline unsigned long
07f2402b JN	368	__generic_copy_from_user_nocheck(void to, const void __user from,
07f2402b JN	369	unsigned long n)
1da177e4	370	{
83f1588e	371	return __copy_user_zeroing(to, from, n);
1da177e4 LT	372	}
1da177e4 LT	373
d9b5444e	374	static inline unsigned long
07f2402b JN	375	__generic_copy_to_user_nocheck(void __user to, const void from,
07f2402b JN	376	unsigned long n)
1da177e4	377	{
83f1588e	378	return __copy_user(to, from, n);
1da177e4 LT	379	}
1da177e4 LT	380
d9b5444e	381	static inline unsigned long
07f2402b	382	__generic_clear_user_nocheck(void __user *to, unsigned long n)
1da177e4	383	{
83f1588e	384	return __do_clear_user(to, n);
1da177e4 LT	385	}
	386
	387	/* without checking */
	388
83f1588e MT	389	#define __copy_to_user(to, from, n) \
	390	__generic_copy_to_user_nocheck((to), (from), (n))
	391	#define __copy_from_user(to, from, n) \
	392	__generic_copy_from_user_nocheck((to), (from), (n))
1da177e4 LT	393	#define __copy_to_user_inatomic __copy_to_user
1da177e4 LT	394	#define __copy_from_user_inatomic __copy_from_user
83f1588e	395	#define __clear_user(to, n) __generic_clear_user_nocheck((to), (n))
1da177e4 LT	396
	397	#define strlen_user(str) strnlen_user((str), 0x7ffffffe)
	398
1da177e4	399	#endif /* _CRIS_UACCESS_H */